WO2018124776A1 - Procédé d'émission et de réception de signal dans un système de communication sans fil, et appareil associé - Google Patents

Procédé d'émission et de réception de signal dans un système de communication sans fil, et appareil associé Download PDF

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Publication number
WO2018124776A1
WO2018124776A1 PCT/KR2017/015661 KR2017015661W WO2018124776A1 WO 2018124776 A1 WO2018124776 A1 WO 2018124776A1 KR 2017015661 W KR2017015661 W KR 2017015661W WO 2018124776 A1 WO2018124776 A1 WO 2018124776A1
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Prior art keywords
resource
sidelink
uplink
downlink
base station
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PCT/KR2017/015661
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English (en)
Korean (ko)
Inventor
김영태
서한별
이윤정
채혁진
우현명
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엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to CN201780080714.XA priority Critical patent/CN110115080B/zh
Priority to US16/473,607 priority patent/US10986610B2/en
Priority to EP17888639.6A priority patent/EP3565336B1/fr
Publication of WO2018124776A1 publication Critical patent/WO2018124776A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a signal transmission and reception method and apparatus therefor for a new radio access technology (RAT) in a wireless communication system.
  • RAT new radio access technology
  • a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (LTE)) communication system will be described in brief.
  • E-UMTS Evolved Universal Mobile Telecommunications System
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • an E-UMTS is located at an end of a user equipment (UE) and a base station (eNode B, eNB, network (E-UTRAN)) and connects an access gateway (AG) connected to an external network.
  • the base station may transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.
  • the cell is set to one of bandwidths such as 1.25, 2.5, 5, 10, 15, and 20Mhz to provide downlink or uplink transmission services to multiple terminals. Different cells may be configured to provide different bandwidths.
  • the base station controls data transmission and reception for a plurality of terminals.
  • For downlink (DL) data the base station transmits downlink scheduling information to inform the corresponding UE of time / frequency domain, encoding, data size, and HARQ (Hybrid Automatic Repeat and reQuest) related information.
  • the base station transmits uplink scheduling information to the terminal for uplink (UL) data, and informs the time / frequency domain, encoding, data size, HARQ related information, etc. that the terminal can use.
  • DL downlink
  • HARQ Hybrid Automatic Repeat and reQuest
  • the core network may be composed of a network node for the user registration of the AG and the terminal.
  • the AG manages the mobility of the UE in units of a tracking area (TA) composed of a plurality of cells.
  • TA tracking area
  • Wireless communication technology has been developed to LTE based on WCDMA, but the demands and expectations of users and operators are continuously increasing.
  • new technological evolution is required to be competitive in the future. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interface, and adequate power consumption of the terminal are required.
  • the present invention proposes a signal transmission / reception method and apparatus therefor for a new RAT in a wireless communication system.
  • a method of transmitting a signal by a terminal in a wireless communication system a resource pool indicating a plurality of resource groups for transmitting and receiving a signal from the first base station (resource pool) ) Receiving a setting; And transmitting a message by using a specific resource unit in a specific resource group among the plurality of resource groups according to the resource pool setting, according to the dynamic resource allocation information, wherein each of the plurality of resource groups is M numbered. (Where M is a natural number, M > 0) and resource units are continuously allocated, and each of the resource units is configured for one of an uplink, a downlink, or a sidelink.
  • the dynamic resource allocation information may indicate that the message is to be transmitted through an Nth resource unit (where N is a natural number, M ⁇ N> 0) among resource units in the specific resource group.
  • the message may be a sidelink message or a message for uplink semi-persistent scheduling (SPS).
  • SPS uplink semi-persistent scheduling
  • the dynamic resource allocation information may be transmitted through RRC signaling.
  • the dynamic resource allocation information may indicate a specific resource unit within a latency range.
  • the dynamic resource allocation information may further include dynamic resource allocation information of an external terminal backhaul signaled through the second base station to the first base station.
  • a terminal for transmitting a signal in a wireless communication system the radio frequency unit; And a processor, wherein the processor receives a resource pool setting indicating a plurality of resource groups for transmitting and receiving a signal of the terminal from a first base station, and sets the resource pool according to dynamic resource allocation information.
  • the processor receives a resource pool setting indicating a plurality of resource groups for transmitting and receiving a signal of the terminal from a first base station, and sets the resource pool according to dynamic resource allocation information.
  • M is a natural number and M> 0
  • Each of the resource units is configured for one of uplink, downlink, or sidelink, and the dynamic resource allocation information is included in the specific resource group. It is characterized by indicating that the message is to be transmitted through the Nth resource unit of the resource units, where N is a natural number, M ⁇ N> 0.
  • RAT New Radio Access Technology
  • FIG. 1 schematically illustrates an E-UMTS network structure as an example of a wireless communication system.
  • FIG. 2 illustrates a structure of a control plane and a user plane of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
  • 3 illustrates physical channels used in a 3GPP system and a general signal transmission method using the same.
  • FIG. 4 illustrates a structure of a radio frame used in an LTE system.
  • 5 illustrates a resource grid for a downlink slot.
  • FIG. 6 illustrates a structure of a downlink radio frame used in an LTE system.
  • FIG. 7 illustrates a structure of an uplink subframe used in an LTE system.
  • D2D UE-to-UE communication
  • FIG. 9 is a reference diagram for explaining a V2V scenario.
  • 10 and 11 are reference diagrams for describing a resource pool for D2D communication.
  • FIG. 12 is a reference diagram for explaining a time resource group for transmitting a sidelink message according to an embodiment of the present invention.
  • FIG. 13 is a diagram referred to for describing a frequency resource group for transmitting a sidelink message according to an embodiment of the present invention.
  • 14 and 15 are reference diagrams for explaining an embodiment of transmitting a sidelink message according to an embodiment of the present invention.
  • FIG. 16 is a diagram for describing a time resource group for transmitting a message for an uplink SPS according to an embodiment of the present invention.
  • 17 is a reference diagram for explaining a frequency resource group for transmitting a message for an uplink SPS according to an embodiment of the present invention.
  • 18 and 19 are reference diagrams for explaining an embodiment of transmitting a message for an uplink SPS according to an embodiment of the present invention.
  • 20 illustrates a base station and a terminal that can be applied to an embodiment of the present invention.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) employs OFDMA in downlink and SC-FDMA in uplink as part of Evolved UMTS (E-UMTS) using E-UTRA.
  • LTE-A Advanced is an evolution of 3GPP LTE.
  • FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
  • the control plane refers to a path through which control messages used by a user equipment (UE) and a network to manage a call are transmitted.
  • the user plane refers to a path through which data generated at an application layer, for example, voice data or Internet packet data, is transmitted.
  • the physical layer which is the first layer, provides an information transfer service to an upper layer by using a physical channel.
  • the physical layer is connected to the upper layer of the medium access control layer through a trans-antenna port channel. Data moves between the medium access control layer and the physical layer through the transport channel. Data moves between the physical layer between the transmitting side and the receiving side through the physical channel.
  • the physical channel utilizes time and frequency as radio resources. Specifically, the physical channel is modulated in the Orthogonal Frequency Division Multiple Access (OFDMA) scheme in the downlink, and modulated in the Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme in the uplink.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the medium access control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
  • RLC radio link control
  • the RLC layer of the second layer supports reliable data transmission.
  • the function of the RLC layer may be implemented as a functional block inside the MAC.
  • the PDCP (Packet Data Convergence Protocol) layer of the second layer performs a header compression function to reduce unnecessary control information for efficiently transmitting IP packets such as IPv4 or IPv6 in a narrow bandwidth wireless interface.
  • IPv4 Packet Data Convergence Protocol
  • the Radio Resource Control (RRC) layer located at the bottom of the third layer is defined only in the control plane.
  • the RRC layer is responsible for control of logical channels, transport channels, and physical channels in connection with configuration, reconfiguration, and release of radio bearers (RBs).
  • RB means a service provided by the second layer for data transmission between the terminal and the network.
  • the RRC layers of the UE and the network exchange RRC messages with each other. If there is an RRC connected (RRC Connected) between the UE and the RRC layer of the network, the UE is in an RRC connected mode, otherwise it is in an RRC idle mode.
  • the non-access stratum (NAS) layer above the RRC layer performs functions such as session management and mobility management.
  • One cell constituting an eNB is set to one of bandwidths such as 1.4, 3, 5, 10, 15, and 20 MHz to provide downlink or uplink transmission services to multiple terminals. Different cells may be configured to provide different bandwidths.
  • the downlink transport channel for transmitting data from the network to the UE includes a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting a paging message, and a downlink shared channel (SCH) for transmitting user traffic or a control message.
  • BCH broadcast channel
  • PCH paging channel
  • SCH downlink shared channel
  • Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
  • the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or a control message.
  • RAC random access channel
  • SCH uplink shared channel
  • BCCH broadcast control channel
  • PCCH paging control channel
  • CCCH common control channel
  • MCCH multicast control channel
  • MTCH multicast. Traffic Channel
  • FIG. 3 is a diagram for describing physical channels used in a 3GPP LTE system and a general signal transmission method using the same.
  • the user equipment that is powered on again or enters a new cell while the power is turned off performs an initial cell search operation such as synchronizing with the base station in step S301.
  • the user equipment receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a cell ID.
  • P-SCH primary synchronization channel
  • S-SCH secondary synchronization channel
  • the user equipment may receive a physical broadcast channel from the base station to obtain broadcast information in a cell.
  • the user equipment may receive a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.
  • DL RS downlink reference signal
  • the user equipment receives the physical downlink control channel (PDCCH) and the physical downlink control channel (PDSCH) according to the physical downlink control channel information in step S302. Specific system information can be obtained.
  • PDCCH physical downlink control channel
  • PDSCH physical downlink control channel
  • the user equipment may perform a random access procedure such as step S303 to step S306 to complete the access to the base station.
  • the user equipment transmits a preamble through a physical random access channel (PRACH) (S303), and responds to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel.
  • PRACH physical random access channel
  • the message may be received (S304).
  • contention resolution procedures such as transmission of an additional physical random access channel (S305) and reception of a physical downlink control channel and a corresponding physical downlink shared channel (S306) may be performed. .
  • UCI uplink control information
  • HARQ ACK / NACK Hybrid Automatic Repeat and reQuest Acknowledgment / Negative-ACK
  • SR Scheduling Request
  • CSI Channel State Information
  • HARQ ACK / NACK is simply referred to as HARQ-ACK or ACK / NACK (A / N).
  • HARQ-ACK includes at least one of positive ACK (simply ACK), negative ACK (NACK), DTX, and NACK / DTX.
  • the CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indication (RI), and the like.
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • RI Rank Indication
  • UCI is generally transmitted through PUCCH, but may be transmitted through PUSCH when control information and traffic data should be transmitted at the same time. In addition, the UCI may be aperiodically transmitted through the PUSCH by the request / instruction of the network.
  • FIG. 4 is a diagram illustrating a structure of a radio frame used in an LTE system.
  • uplink / downlink data packet transmission is performed in subframe units, and one subframe is defined as a predetermined time interval including a plurality of OFDM symbols.
  • the 3GPP LTE standard supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).
  • the downlink radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • One slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • RBs resource blocks
  • a resource block (RB) as a resource allocation unit may include a plurality of consecutive subcarriers in one slot.
  • the number of OFDM symbols included in one slot may vary depending on the configuration of a cyclic prefix (CP).
  • CPs include extended CPs and normal CPs.
  • the number of OFDM symbols included in one slot may be seven.
  • the OFDM symbol is configured by the extended CP, since the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is smaller than that of the standard CP.
  • the number of OFDM symbols included in one slot may be six. If the channel state is unstable, such as when the user equipment moves at a high speed, an extended CP may be used to further reduce intersymbol interference.
  • one subframe includes 14 OFDM symbols.
  • the first up to three OFDM symbols of each subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • Type 2 radio frames consist of two half frames, each half frame comprising four general subframes including two slots, a downlink pilot time slot (DwPTS), a guard period (GP) and It consists of a special subframe including an Uplink Pilot Time Slot (UpPTS).
  • DwPTS downlink pilot time slot
  • GP guard period
  • UpPTS Uplink Pilot Time Slot
  • DwPTS is used for initial cell search, synchronization or channel estimation at the user equipment.
  • UpPTS is used for channel estimation at base station and synchronization of uplink transmission of user equipment. That is, DwPTS is used for downlink transmission and UpPTS is used for uplink transmission.
  • UpPTS is used for PRACH preamble or SRS transmission.
  • the guard period is a period for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • the current 3GPP standard document defines a configuration as shown in Table 1 below.
  • Table 1 In the case of DwPTS and UpPTS, the remaining area is set as a protection interval.
  • the structure of the type 2 radio frame that is, UL / DL configuration (UL / DL configuration) in the TDD system is shown in Table 2 below.
  • D denotes a downlink subframe
  • U denotes an uplink subframe
  • S denotes the special subframe.
  • Table 2 also shows the downlink-uplink switching period in the uplink / downlink subframe configuration in each system.
  • the structure of the radio frame described above is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of symbols included in the slot may be variously changed.
  • 5 illustrates a resource grid for a downlink slot.
  • the downlink slot is in the time domain Contains OFDM symbols and in the frequency domain Contains resource blocks.
  • the number of OFDM symbols included in the downlink slot may be modified according to the length of a cyclic prefix (CP).
  • CP cyclic prefix
  • Each element on the resource grid is called a Resource Element (RE), and one resource element is indicated by one OFDM symbol index and one subcarrier index.
  • the number of resource blocks included in the downlink slot ( ) depends on the downlink transmission bandwidth set in the cell.
  • FIG. 6 illustrates a structure of a downlink subframe.
  • up to three (4) OFDM symbols located at the front of the first slot of a subframe correspond to a control region to which a control channel is allocated.
  • the remaining OFDM symbols correspond to data regions to which the Physical Downlink Shared Channel (PDSCH) is allocated.
  • Examples of a downlink control channel used in LTE include a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), a Physical Hybrid ARQ Indicator Channel (PHICH), and the like.
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols used for transmission of a control channel within the subframe.
  • the PHICH carries a HARQ ACK / NACK (Hybrid Automatic Repeat request acknowledgment / negative-acknowledgment) signal in response to uplink transmission.
  • DCI downlink control information
  • the DCI includes resource allocation information and other control information for the user device or user device group.
  • the DCI includes uplink / downlink scheduling information, uplink transmission (Tx) power control command, and the like.
  • the PDCCH includes a transmission format and resource allocation information of a downlink shared channel (DL-SCH), a transmission format and resource allocation information of an uplink shared channel (UL-SCH), a paging channel, Resource allocation information of upper-layer control messages such as paging information on PCH), system information on DL-SCH, random access response transmitted on PDSCH, Tx power control command set for individual user devices in a group of user devices, Tx power It carries control commands and activation instruction information of Voice over IP (VoIP).
  • a plurality of PDCCHs may be transmitted in the control region.
  • the user equipment may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or a plurality of consecutive control channel elements (CCEs).
  • CCEs control channel elements
  • the CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on radio channel conditions.
  • the CCE corresponds to a plurality of resource element groups (REGs).
  • the format of the PDCCH and the number of PDCCH bits are determined according to the number of CCEs.
  • the base station determines the PDCCH format according to the DCI to be transmitted to the user equipment, and adds a cyclic redundancy check (CRC) to the control information.
  • the CRC is masked with an identifier (eg, a radio network temporary identifier (RNTI)) according to the owner or purpose of use of the PDCCH.
  • RNTI radio network temporary identifier
  • an identifier eg, cell-RNTI (C-RNTI)
  • C-RNTI cell-RNTI
  • P-RNTI paging-RNTI
  • SI-RNTI system information RNTI
  • RA-RNTI random access-RNTI
  • FIG. 7 illustrates a structure of an uplink subframe used in LTE.
  • an uplink subframe includes a plurality (eg, two) slots.
  • the slot may include different numbers of SC-FDMA symbols according to the CP length.
  • the uplink subframe is divided into a data region and a control region in the frequency domain.
  • the data area includes a PUSCH and is used to transmit data signals such as voice.
  • the control region includes a PUCCH and is used to transmit uplink control information (UCI).
  • the PUCCH includes RB pairs located at both ends of the data region on the frequency axis and hops to a slot boundary.
  • PUCCH may be used to transmit the following control information.
  • SR Service Request: Information used for requesting an uplink UL-SCH resource. It is transmitted using OOK (On-Off Keying) method.
  • HARQ ACK / NACK This is a response signal for a downlink data packet on a PDSCH. Indicates whether the downlink data packet was successfully received. One bit of ACK / NACK is transmitted in response to a single downlink codeword, and two bits of ACK / NACK are transmitted in response to two downlink codewords.
  • CSI Channel State Information
  • the CSI includes a channel quality indicator (CQI), and the feedback information related to multiple input multiple output (MIMO) includes a rank indicator (RI), a precoding matrix indicator (PMI), a precoding type indicator (PTI), and the like. 20 bits are used per subframe.
  • CQI channel quality indicator
  • MIMO multiple input multiple output
  • RI rank indicator
  • PMI precoding matrix indicator
  • PTI precoding type indicator
  • the amount of control information (UCI) that a user equipment can transmit in a subframe depends on the number of SC-FDMAs available for control information transmission.
  • SC-FDMA available for transmission of control information means the remaining SC-FDMA symbol except for the SC-FDMA symbol for transmitting the reference signal in the subframe, and in the case of the subframe in which the Sounding Reference Signal (SRS) is set, the last of the subframe SC-FDMA symbols are also excluded.
  • the reference signal is used for coherent detection of the PUCCH.
  • D2D UE-to-UE Communication
  • the D2D communication scheme can be largely divided into a scheme supported by a network / coordination station (for example, a base station) and a case not otherwise.
  • a network / coordination station for example, a base station
  • FIG. 8A transmission / reception of a control signal (eg, grant message), HARQ, Channel State Information, etc. is performed by a network / coordination station and performs D2D communication.
  • a control signal eg, grant message
  • HARQ Channel State Information
  • FIG. 8 (b) the network provides only minimal information (for example, D2D connection information available in a corresponding cell), but terminals performing D2D communication form a link and transmit and receive data. The way of doing this is shown.
  • V2X vehicle to everything
  • V2X LTE-based vehicle-to-everything
  • IT Informatin Technology
  • V2V vehicle-to-infrastructure
  • V2I vehicle-to-infrastructure
  • V2P vehicle-to-pedestrian
  • V2N vehicle-to-network
  • the vehicle continuously broadcasts information about its position, speed, direction, and the like.
  • the surrounding vehicle that receives the broadcasted information recognizes the movement of the vehicles around itself and utilizes it for accident prevention.
  • each vehicle similarly to an individual having a terminal having a form of a smart phone or a smart watch, each vehicle also installs a specific type of terminal (or user equipment (UE)).
  • the UE installed in the vehicle refers to a device that receives the actual communication service in the communication network.
  • the UE installed in the vehicle may be connected to the eNB in the E-UTRAN to receive the communication service.
  • V2X communication there are many things to consider when implementing V2X communication in a vehicle. This is because astronomical costs are required for the installation of traffic safety infrastructure such as V2X base stations. That is, to support V2X communication on all roads where the vehicle can move, more than hundreds of thousands of V2X base stations need to be installed. In addition, since each network node is connected to the Internet or a central control server using a wired network as a base for stable communication with a server, the installation and maintenance cost of the wired network is also high.
  • the present invention proposes a method for determining a resource to be used in communication when a UE performs communication with another UE by using a direct radio channel.
  • This may be referred to as direct signal transmission or reception between devices or device-to-device (D2D) communication, or may be referred to as sidelink to distinguish it from downlink (DL) and uplink (UL) of existing cellular communication.
  • D2D device-to-device
  • DL downlink
  • UL uplink
  • communication between a plurality of devices may be referred to as a vehicle to vehicle (V2V) by connecting a vehicle to a vehicle.
  • V2V vehicle to vehicle
  • a UE means a terminal (or a car) of a user, but may be regarded as a kind of UE to which the present invention can be applied when network equipment such as an eNB transmits and receives a signal according to a communication method between the UEs.
  • the eNB may receive the D2D signal transmitted by the UE, and furthermore, a signal transmission / reception method of the UE designed for D2D transmission may be applied to an operation in which the UE transmits data to the eNB.
  • UE1 may operate to select a resource unit corresponding to a specific resource in a resource pool representing a set of resources and transmit a D2D signal using the resource unit.
  • UE2 which is a receiving UE, receives a resource pool in which UE1 can transmit a D2D signal, and detects a signal of UE1 in the resource pool.
  • the resource pool may be notified by the base station when UE1 is in the connection range of the base station, and may be determined by another UE or determined as a predetermined resource when it is outside the connection range of the base station.
  • a resource pool is composed of a plurality of resource units, and each UE may select one or a plurality of resource units to use for transmitting its own D2D signal.
  • a resource pool may mean a set of resource units that can be used for transmission by a UE that wants to transmit a D2D signal.
  • resource pools can be subdivided into several types. First, they may be classified according to the content of the D2D signal transmitted from each resource pool. For example, the content of the D2D signal may be classified as follows, and a separate resource pool may be set for each.
  • SA Scheduling assignment
  • MCS modulation and coding scheme
  • the SA signal may be multiplexed and transmitted together with D2D data on the same resource unit.
  • the SA resource pool means a resource pool including resources in which an SA is multiplexed with D2D data and transmitted. can do. This may be called a D2D (sidelink) control channel.
  • D2D data channel A resource pool composed of resources used by a transmitting UE to transmit user data using resources designated through an SA. If it is also possible to be multiplexed and transmitted together with D2D data on the same resource unit, the resource pool for the D2D data channel may be a form in which only the D2D data channel having the form excluding SA information is transmitted. In other words, the resource element used to transmit SA information on an individual resource unit in the SA resource pool is still used to transmit D2D data in the D2D data channel resource pool.
  • Discovery message or sidelink discovery channel resource pool for a message that allows a sending UE to send information, such as its ID, to allow a neighboring UE to discover itself.
  • Synchronization signal / channel or sidelink synchronization signal (sidelink broadcast channel): A signal in which a transmitting UE achieves the purpose of time / frequency synchronization with a transmitting UE by transmitting a synchronization signal and information related to synchronization. Resource pools / channels
  • SA and data may use separate resource pools on subframes
  • two types of resource pools may be configured in the same subframe when the UE can simultaneously transmit SA and data in one subframe.
  • different resource pools may be used according to the transmission / reception attributes of the D2D signal.
  • the transmission timing determination method of the 152D signal for example, whether it is transmitted at the reception of the synchronization reference signal or at a timing of the reception of the synchronization reference signal, Whether the transmission is applied or not
  • a resource allocation method e.g., whether the eNB assigns a transmission resource of an individual signal to an individual transmitting UE or whether an individual transmitting UE selects an individual signaling resource on its own within a resource pool
  • the format for example, the number of symbols each D2D signal occupies in one subframe or the number of subframes used for transmitting one D2D signal), the signal strength from the eNB, the transmission power strength of the D2D UE, etc. Can be divided into different resource pools.
  • Mode 1 a transmission resource region is set in advance, or the eNB designates a transmission resource region, and the UE directly selects a transmission resource in a method of directly instructing the eNB to transmit resources of the D2D transmitting UE in D2D communication.
  • Mode 2 a transmission resource region is set in advance, or the eNB designates a transmission resource region, and the UE directly selects a transmission resource in a method of directly instructing the eNB to transmit resources of the D2D transmitting UE in D2D communication.
  • Mode 2 a transmission resource region is set in advance, or the eNB designates a transmission resource region, and the UE directly selects a transmission resource in a method of directly instructing the eNB to transmit resources of the D2D transmitting UE in D2D communication.
  • Mode 2 a transmission resource region is set in advance, or the eNB designates a transmission resource region, and the UE directly selects a transmission resource in a method of directly instructing the eNB to transmit
  • the D2D may be referred to as sidelink
  • the SA may be a physical sidelink control channel (PSCCH), a D2D synchronization signal (D2D synchronization signal) before the D2D communication transmitted with a sidelink synchronization signal (SSS), and the SSS.
  • the control channel for transmitting basic information may be referred to as a physical sidelink broadcast channel (PSBCH) or a physical D2D synchronization channel (PD2DSCH).
  • PSBCH physical sidelink broadcast channel
  • PD2DSCH physical D2D synchronization channel
  • a signal for notifying that a specific terminal is in the vicinity thereof may include an ID of the specific terminal
  • a PSDCH physical sidelink discovery channel
  • V2X communication it is assumed that there is a control channel and a data channel like the 152D.
  • a vehicle receives and transmits a periodic message. If the vehicle is called a UE, the UE can decode the control channel being transmitted or find the resource location of the currently transmitted messages through energy sensing of the data channel. It may even know the resource location to which transmitting UEs will transmit.
  • the present invention describes a method of setting a resource unit of N or N or more specific messages (eg, sidelinks) in a set window by applying / setting a window in a time or frequency section of the resource.
  • the degree of change may be semi-statically changed through signaling such as RRC signaling, and whether the slot or subframe is uplink or downlink through signaling or a sequence every slot or subframe. You can make it variable by telling it.
  • downlink or uplink is dynamic allocation
  • flexibility in terms of resource operation is obtained.
  • sidelinks also need to be dynamically allocated together with uplink and downlink.
  • a window is applied / set in a time or frequency interval of a resource, so that N or N or more specific messages (eg, sidelink or uplink) are set within the set window. It is proposed that there exists a resource unit to which the SPS) can be transmitted.
  • N or at least N sidelink slots or sidelink subframes are configured in each group.
  • Each of these time resource groups consists of a contiguous time, and individual time resource groups may be set to be non-contiguous or may be set to overlap.
  • the size of each time resource group may be set to be equal for even division.
  • FIG. 12 shows an example of time resource grouping.
  • contiguous time resources having a time size of t ms are placed as time resource groups, respectively, and contiguous times are connected between time groups.
  • N or at least N sidelink slots or sidelink subframes may be set.
  • the base station may operate such that there are N or at least N sidelink slots or sidelink subframes in each time group.
  • the size of each time group, the interval between time groups, the number of sidelink slots or subframes in the time group may be set together at the time of resource pool configuration, or after setting up the resource pool. You can change it.
  • the reason for the change in the middle is to adjust the amount of sidelink resources according to the amount of traffic on the sidelink.
  • each frequency resource group is composed of contiguous frequency resources, and may be set so as not to be contiguous or overlapping between individual frequency resource groups.
  • the size of each frequency resource group may be set to be different from each other.
  • the size of each frequency group, the interval between frequency groups, and the number of resource blocks in the frequency group may be set together when setting the resource pool, or may be changed in the middle after setting the resource pool.
  • the reason for the change in the middle is to adjust the amount of sidelink resources according to the amount of traffic on the sidelink.
  • the time resource grouping of the scheme 1-1 and the frequency resource grouping of the scheme 1-2 are respectively defined and may be operated independently.
  • the time resource and the frequency resource may be grouped together so that L time-frequency blocks exist for each time-frequency resource.
  • the size of each time-frequency group, the time-frequency interval between time-frequency groups, and the number of L time-frequency blocks in the time-frequency group can be set together when setting the resource pool or after setting the resource pool. You can change it.
  • the reason for the change in the middle is to adjust the amount of sidelink resources according to the amount of traffic on the sidelink.
  • the base station informs the dynamic resource allocation information (ie, uplink, downlink or sidelink) of the slot or subframe until the next RRC signaling semi-statically by RRC signaling.
  • the UE can know dynamic resource allocation information in advance based on such signaling. In this case, the base station may transmit the RRC signaling when the UE is awake or several times in accordance with the Discontinued Reception (DRX) cycle of the UE to allow the UE to receive well.
  • DRX Discontinued Reception
  • the dynamic resource allocation information of the current slot or subframe may be informed through control signaling in a slot or subframe at a certain time before.
  • the resource group of the first embodiment of the present invention indicates the number of sidelinks (or uplinks or downlinks), so that all control channels cannot be monitored and thus the usage type of the resource (ie, uplink).
  • the transmitting UE may transmit a resource within a T-time resource group (or an F-th frequency resource). Resource reservation is performed for the K1-sidelink slot or subframe (or the K2-frequency resource block, or the K3-time-frequency block) within the group or within the TF-th time-frequency resource group.
  • the resource reservation may mean a resource to be transmitted every cycle during periodic transmission or may mean a resource that is reserved for retransmission during Ack / Nack-based HARQ operation for one transport block (TB).
  • FIG. 14 is a reference diagram for explaining a sidelink message transmission according to an embodiment of the present invention.
  • the size of a resource group is set to 4 subframes based on a time resource as in the 1-1 scheme, the interval between time resource groups is 0, and the sidelink subframes in the time group are 2 subframes. Let's do it.
  • four subframes in a resource group can be determined as one usage type among uplink, downlink and sidelink by dynamic allocation of uplink, downlink and sidelink resources, What type of current is used may be indicated by the first symbol of the current subframe, or may be indicated by a previous subframe.
  • a transmitting UE transmits a message through a side link in FIG. 14, it is assumed that periodic transmission of 8 ms is performed and one subframe is 1 ms.
  • the transmitting UE needs to reserve a sidelink for periodic message transmission of 8 ms, but it is a situation in which a resource is unknown because of dynamic allocation.
  • the transmitting UE may reserve a subframe of the first appearing sidelink every two resource groups to maintain a period of approximately 8 ms.
  • the transmitting UE blindly detects which type of uplink, downlink, or sidelink is used for dynamic allocation, and detects which subframe is the first sidelink subframe for every two resource groups. And transmits a message in the detected subframe.
  • the receiving UE also blindly detects the usage type of the uplink, the downlink, or the sidelink subframes that are changed to dynamic allocation.However, in case of broadcast, a subframe is included in each resource group in order to receive all the sidelinks. It detects whether it is a frame and receives a message in the detected subframe. If it is a unicast transmission, the receiving UE detects which subframe is the first sidelink subframe per two resource groups and receives a message in the subframe.
  • the above-described operation can be applied in the same manner to the 1-2 scheme and the 1-3 scheme, or when the location of the resource of the sidelink is indicated by the bitmap in the RRC signaling or control channel, the transmitting / receiving UE is determined for the usage type. The same is applicable without blind detection only.
  • 15 is a reference diagram for explaining an embodiment of the present invention considering initial transmission.
  • the time resource is set to 4 subframes in the size of a resource group
  • the interval between time resource groups is 0, and the sidelink subframes in the time group are 2 subframes as in the 1-1 scheme.
  • four subframes in a resource group may be determined as one usage type among uplink, downlink, and sidelink by dynamically allocating uplink, downlink, and sidelink resources. Which type of subframe is currently used may be indicated by the first symbol of the current subframe or by a previous subframe.
  • a transmitting UE transmits a message through a sidelink in FIG. 15, it is a situation of reserving a resource location of retransmission while performing initial transmission, and it is not known which resource is a sidelink due to dynamic allocation. to be.
  • the latency is 5ms and the maximum retransmission is once. Therefore, the transmitting UE may be right to reserve a retransmission in the first subframe of the G3 resource group 5ms after the second sidelink resource of the G1 resource group that it transmits in order to maintain a delay rate of approximately 5ms.
  • the first subframe of the G3 resource group is not currently a sidelink resource and has the possibility that it may not be at the time of reserve.
  • the delay rate condition (or range) may not be satisfied. Accordingly, the second sidelink resource of the G2 resource group is reserved as the retransmission resource.
  • the transmitting UE blindly detects which type of uplink, downlink or sidelink is used for the dynamic allocation, and detects which subframe is the second sidelink subframe in the G2 resource group, thereby detecting a message in the subframe. send.
  • the receiving UE When the receiving UE also blindly detects a usage type of uplink, downlink, or sidelink, which is changed to dynamic allocation, and transmits a Nack, it detects which subframe is a sidelink subframe for each G2 resource group, Receive a message from a sidelink resource.
  • the above-described operation may be applied in the same manner to the 1-2 scheme and the 1-3 scheme, or when the location of the resource of the sidelink is indicated by the bitmap in the RRC signaling or the control channel, the transmission / reception UE is used. The same applies without blind detection for.
  • UEs at the boundary of the cell will use the sidelink resources of the serving cell, but need to be received at the sidelink resources of the next cell as well.
  • the vehicle when a vehicle sends and receives a safety message of a V2X service, the vehicle must listen to a message transmitted from a sidelink resource of a side cell vehicle.
  • uplink, downlink, and sidelink are dynamically allocated, it may be difficult to find sidelink resources because the sidelink resources of the next cell are dynamically allocated. Therefore, the serving cell needs to broadcast information about sidelink dynamic allocation from the side cell to the UEs.
  • Information on such sidelink dynamic allocation may be indicated by a bitmap at which subframe and at which frequency sidelink resources appear in the next cell. If you tell every cell next to the bitmap, there may be too much information to broadcast.
  • configuration information of a side cell on how much sidelink resources exist for each resource group may be broadcasted to UEs. Using this information, the receiving UEs blindly detect and find the location of the sidelink resource in each resource group in the resource of the next cell, and then receive a message from the resource.
  • the usage type of such a subframe may be indicated by the first symbol of the current subframe or by a previous subframe.
  • the dynamic resource allocation information for the next cell may be received by the UE through backhaul signaling between base stations. This technical feature will be described in more detail in the third embodiment.
  • N or at least N uplink slots or uplink subframes are configured in each group.
  • Each of these time resource groups may consist of contiguous times, and may not be contiguous or may overlap between individual time resource groups.
  • the size of each time resource group may be set to be the same.
  • time resource grouping shows an example of time resource grouping.
  • contiguous time resources having a time size of t ms are provided as time resource groups, respectively.
  • uplink slots or uplink subframes may be configured such that N or at least N subframes exist.
  • the base station may be operated such that there are N or at least N uplink slots or uplink subframes in each time group.
  • the size of each time group, the interval between time groups, and the number of uplink slots or subframes in the time group may be set together when setting the resource pool, or may be changed in the middle after setting the resource pool.
  • the reason for the change in the middle is to adjust the amount of uplink resources according to the amount of uplink traffic.
  • each group is configured such that there are M or at least M uplink resource blocks.
  • Each of these frequency resource groups is composed of contiguous frequency resources, and may be set not to be contiguous or overlapping with each other.
  • the size of each frequency resource group may be set to be different from each other.
  • the size of each frequency group, the interval between frequency groups, and the number of resource blocks in the frequency group may be set together when setting the resource pool, or may be changed in the middle after setting the resource pool.
  • the reason for the change in the middle is to adjust the amount of uplink resources according to the amount of uplink traffic.
  • the time resource grouping of the 2-1 scheme and the frequency resource grouping of the 2-2 scheme may be defined and operated independently.
  • the time and frequency resources may be grouped together so that L time-frequency blocks exist for each time-frequency resource.
  • the size of each time-frequency group, the time-frequency interval between time-frequency groups, and the number of L time-frequency blocks in the time-frequency group can be set together when setting the resource pool or after setting the resource pool. You can change it.
  • the reason for the change in the middle is to adjust the amount of uplink resources according to the amount of uplink traffic.
  • the base station informs the dynamic resource allocation information dynamically allocated to the slot or subframe until the next RRC signaling semi-statically with the RRC signaling, the UE knows the dynamic resource allocation information in advance based on the signaling. Can be. In this case, the base station may transmit the RRC signaling when the UE is awake or in multiple times according to the DRX cycle of the UE so that the UE can receive it well.
  • the dynamic resource allocation information of the current slot or subframe may be informed through control signaling in a slot or subframe at a certain time before.
  • the resource group according to the second embodiment of the present invention indicates the number of sidelinks (or uplinks or downlinks), so that all the control channels cannot be monitored and thus the usage type of the resource is not known. If not, the UE that does not know the number of sidelinks (or uplinks or downlinks) in the resource group may be able to know the number of sidelinks (or uplinks or downlinks) in the resource group. have.
  • the transmitting UE uses the T-th when periodically using the resources for semi-persistent scheduling (SPS).
  • SPS semi-persistent scheduling
  • a K1 th uplink slot or subframe or a K2 th frequency resource block, or a K3 th time-frequency block Is used as a resource.
  • resource use may mean a resource to be transmitted every cycle during periodic transmission, or may be a resource allocated by the base station for retransmission during Ack / Nack-based HARQ operation for one transport block (TB).
  • TB transport block
  • 18 is a reference diagram for explaining message transmission for an uplink SPS according to an embodiment of the present invention.
  • the time resource is set to the size of the resource group to 4 subframes, the interval between time resource groups is 0, and the uplink subframe in the time group is 2 subframes.
  • four subframes in the resource group may be determined as one type of use of uplink, downlink, and sidelink by dynamic allocation of uplink, downlink, and sidelink resources. Which type of subframe is currently used may be indicated by the first symbol of the current subframe or by a previous subframe. In this case, when a transmitting UE transmits a message through uplink in FIG. 18, it is assumed that periodic transmission of 8 ms is performed and one subframe is 1 ms.
  • the transmitting UE needs to periodically use uplink resources for periodic message transmission of 8ms, and it is a situation in which a resource is not known due to dynamic allocation. Thus, the transmitting UE uses the first appearing subframe every two resource groups to maintain a period of approximately 8 ms.
  • the transmitting UE blindly detects which type of uplink, downlink or sidelink is used for the dynamic allocation, and detects which subframe is the first uplink subframe for every two resource groups, and then sends a message in the subframe. Send it.
  • the above-described operation may be applied in the same manner in the case of the 2-2 scheme and the 2-3 scheme, or when the location of the uplink resource is indicated by the RRC signaling or the control channel as a bitmap, the transmission / reception UE is used. The same applies without blind detection for.
  • FIG. 19 is a diagram for describing an embodiment of the present invention considering initial transmission.
  • a time resource is set to 4 subframes in size of a resource group as in the 2-1 scheme, and the interval between time resource groups is shown.
  • Is 0 and the sidelink subframe in the time group is 2 subframes.
  • four subframes in a resource group may be determined as one usage type of uplink, downlink, and sidelink, respectively by dynamic allocation of uplink, downlink, and sidelink resources.
  • Which type of subframe is currently used may be indicated by the first symbol of the current subframe or by a previous subframe. In this case, when a transmitting UE transmits a message through uplink in FIG.
  • the base station should inform the resource location of retransmission while performing initial transmission. It is not determined whether it is a link. We can assume that the delay is 5ms and the maximum retransmission is once. Therefore, in order to maintain a delay rate of approximately 5 ms, the base station may be allocated with retransmission in the first subframe of the G3 resource group 5 ms after the second uplink resource of the G1 resource group transmitted by the base station. However, the first subframe of the G3 resource group is not currently an uplink resource, and has a possibility that it may not be at the time to inform the retransmission resource. Therefore, if the first uplink resource of the G3 resource group is used as a retransmission resource, the delay rate condition may not be satisfied.
  • the second uplink resource of the G2 resource group is reserved as the retransmission resource.
  • the transmitting UE blindly detects which type of uplink, downlink, or sidelink is used for dynamic allocation, and detects which subframe is the second uplink subframe in the G2 resource group, and detects a message in the subframe. send.
  • the base station also receives a message from the second uplink resource in the G2 resource group when blind detection is performed on which type of uplink, downlink or sidelink is used for the dynamic allocation, and the Nack is transmitted.
  • the operation described above may be applied in the same manner to the case of the 2-2 scheme and the 2-3 scheme, or the transmitting UE is used when the location of the uplink resource is indicated by the bitmap in the RRC signaling or control channel. The same applies without blind detection for the type.
  • the second embodiment has been described for uplink SPS, it is also applicable to resource allocation for other periodic transmission.
  • it may be sidelink SPS allocation, periodic allocation of RACH resources, resource allocation for Periodic CSI report, and the like.
  • the dynamic resource allocation information for the next cell may be received by the UE through backhaul signaling between base stations, and this technical feature will be described in more detail in the third embodiment.
  • uplink, downlink, and sidelink communication in a new RAT (NR) in which sidelinks are dynamically allocated is dealt with.
  • NR new RAT
  • NR discusses the environment in which uplink, downlink, and sidelinks dynamically change according to time and frequency according to the type and amount of data, and these links between base stations are independently or all the same, Likewise, an environment set in a specific group unit may be considered.
  • a transmitting UE may be allocated a resource for initial transmission and a resource for HARQ retransmission according to configuration, and the receiving UE should be able to know the location of the resource where HARQ retransmission will occur.
  • the receiving UE since it is possible to indirectly inform the retransmission position for HARQ retransmission, the receiving UE should be able to obtain dynamic resource allocation information of the base station to which the transmitting UE belongs in order to estimate the absolute HARQ retransmission resource position.
  • UEs belonging to the same group when the dynamic resource allocation information of the base stations are all the same or the dynamic resource allocation information is performed on a base station or sector group basis By obtaining the dynamic resource allocation information for the base station dynamic resource allocation information of the other UE to perform the sidelink communication.
  • these settings may be different, and for HARQ retransmission, a receiving UE necessarily acquires dynamic resource allocation information of a base station to which a transmitting UE belongs. Should be.
  • an environment in which resource setting is dynamically configured may be divided into scenarios of Cases 1 to 3 below.
  • -Settings other than sidelinks may be different.
  • the UE can automatically determine the settings of the designated cell by reading its serving cell settings and using the same settings
  • the setting of cell 1 and the setting of cell 2 can be linked. For example, the next subframe of a subframe set to sidelink in cell 1 is always set to sidelink in cell 2
  • -Settings other than sidelinks may be different.
  • the UE can automatically determine the settings of the designated cell by reading its serving cell settings and using the same settings
  • the setting of cell 1 and the setting of cell 2 can be linked. For example, the next subframe of a subframe set to sidelink in cell 1 is always set to sidelink in cell 2
  • Case 3 All base stations or sectors establish sidelink links independently of each other.
  • the dynamic resource allocation information on the uplink, downlink, or sidelink of the base station is transmitted from another base station in a situation of being transmitted by an upper layer signal or by control information of a slot or subframe.
  • a method of transmitting sidelink resource allocation information of a transmitting UE to a receiving receiving UE will be described.
  • Step 3-1-A At any time n, the base station 1 transmits to the transmitting UE1 higher layer information including the dynamic resource usage setting for the uplink / downlink / sidelink of the base station 1 from n + v to n + w. Signaled (eg, RRC signaling). Where v and w are time values greater than 0, where v is the time delay until UE1 receives information on dynamic resource allocation information transmitted by base station 1 and can utilize the information. Length of time that holds dynamic resource allocation information for uplink / downlink / sidelink of a link to be set. w may be greater than, equal to or less than the maximum retransmission allowance delay d of the UEs.
  • Signaled eg, RRC signaling
  • Step 3-1-B base station 1 transmits all the information about the dynamic allocation for the uplink / downlink / sidelink of the link up to n + b through the inter-base station interface to the adjacent base station 2.
  • b is a time value greater than zero.
  • such a link transmission may be a periodic transmission having a period of b, and may be transmitted at the request of UEs or a base station instead of the periodic transmission. If resources are grouped in subframe or slot units, the same can be applied.
  • Step 3-1-C The base station 2, which has received the information containing the resource usage setting from the base station 1 to the n + b, informs the receiving UE2 of the upper layer signaling (for example, RRC signaling) again.
  • This transmission may be a periodic transmission with a period, and in the case of a non-periodic transmission, a request of the UE or a base station may transmit the request by itself.
  • Step 3-1-D UE1 receives the dynamic resource allocation information received from the base station 1 to send data to the receiving UE2 serviced from the base station 2, and receives the sidelink resource or allocates the sidelink resource by itself.
  • the initial transmission time and the retransmission time are n + t and n + t + r, respectively.
  • the retransmission delay time r must be smaller than d. If r is less than or equal to wt, the retransmission position can be determined as an absolute position. If r is greater than wt, the position or index of the group where retransmission occurs using subframe or slot unit grouping, and You can indirectly order sidelinks within a group.
  • Step 3-1-E UE1 transmits the first data at time n + t using the allocated resource, and informs the sidelink control channel of the location of the retransmission resource for the NACK. If r is less than or equal to w-t, and UE1 informs the absolute position of retransmission for NACK, UE2 can know the retransmission position without any additional performance. However, if r is greater than wt and indirectly informs the location of the resource to be retransmitted by using a resource grouping method, it is possible to estimate the location of the retransmission using the dynamic resource allocation information of BS1 received in step 3-1-B. Can be.
  • Step 3-2-A At any time n, base station 1 has dynamic resource allocation information for uplink / downlink / sidelink up to time n + w.
  • w is a value greater than 0, and is the length of time that the base station 1 has dynamic resource allocation information for uplink / downlink / sidelink of a link to be configured in the future.
  • w is a time value greater than zero.
  • the base station 1 informs the transmitting UE1, which is serviced by the base station, of the uplink / downlink / sidelink for the time n + a through the control channel. That is, the base station 1 transmits dynamic resource allocation information such as uplink, downlink, or sidelink after a time a based on the current time n to the UEs serving it.
  • a may be dynamically allocated to uplink / downlink / sidelink or may be performed with a predetermined value.
  • the time a value is set to a value less than w and d.
  • Step 3-2-B Base station 1 transmits information including dynamic resource allocation information for uplink / downlink / sidelink up to time n + b to the adjacent base station 2 through an inter-base station interface.
  • b is greater than 0 and less than w.
  • dynamic resource allocation information transmission may be a periodic transmission having a period of b, and may be transmitted at the request of the UEs or the base station instead of the periodic transmission.
  • Step 3-2-C The base station 2 receiving the information containing the dynamic resource usage setting for the uplink / downlink / sidelink from the base station 1 up to the current time n + b, the base station 2 again receives this information to the receiving UE2 higher layer signal Send it through.
  • This transmission may be a periodic transmission with a period, and in the case of a non-periodic transmission, a request of the UE or a base station may transmit the request by itself.
  • Step 3-2-D UE1 receives the dynamic resource allocation information received from the base station 1 to send data to the receiving UE2 serviced from the base station 2, and receives the sidelink resource or allocates the sidelink resource by itself.
  • the initial transmission time and the retransmission time are n + t and n + t + r, respectively.
  • the retransmission delay time r must be smaller than d. If r is less than or equal to at, the retransmission position can be determined as an absolute position. If r is greater than at, the position or index of the group where retransmission occurs using subframe or slot unit grouping, and You can indirectly order sidelinks within a group.
  • Step 3-2-E UE1 transmits the first data at time n + t using the allocated resource, and informs the sidelink control channel of the location of the retransmission resource for the NACK. If r is less than or equal to a-t, and UE1 informs the absolute position of retransmission for NACK, UE2 can know the retransmission position without any additional performance. However, if r is greater than at, and indirectly informs the location of the resource to be retransmitted by using a resource grouping method, it is possible to estimate the location of the retransmission using the dynamic resource allocation information of BS1 received in step 3-2-B. Can be.
  • the third embodiment may also be applied to the relationship between the retransmission for the initial transmission and the retransmission for the initial retransmission.
  • the base station 2 informs the dynamic resource allocation information of the uplink / downlink / sidelink of the UE1 not only to the UE2 serviced by the base station 2 but also to the other UEs, and the UEs can use the relay to relay. have.
  • UEs located at cell boundaries utilize a connection identifier (CID) of a base station to which they are serviced, or estimate CIDs of neighbor base stations through direct communication between base stations, and uniquely allocate sidelinks through CIDs. Information can be obtained.
  • CID connection identifier
  • 20 illustrates a base station and a terminal that can be applied to an embodiment of the present invention.
  • a wireless communication system includes a base station (BS) 110 and a terminal (UE) 120.
  • Base station 110 includes a processor 112, a memory 114, and a radio frequency (RF) unit 116.
  • the processor 112 may be configured to implement the procedures and / or methods proposed in the present invention.
  • the memory 114 is connected to the processor 112 and stores various information related to the operation of the processor 112.
  • the RF unit 116 is connected with the processor 112 and transmits and / or receives a radio signal.
  • the terminal 120 includes a processor 122, a memory 124, and an RF unit 126.
  • the processor 122 may be configured to implement the procedures and / or methods proposed by the present invention.
  • the memory 124 is connected with the processor 122 and stores various information related to the operation of the processor 122.
  • the RF unit 126 is connected with the processor 122 and transmits and / or receives a radio signal.
  • the base station 110 and / or the terminal 120 may have a single antenna or multiple antennas.
  • each component or feature is to be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
  • Certain operations described in this document as being performed by a base station may in some cases be performed by an upper node thereof. That is, it is obvious that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • a base station may be replaced by terms such as a fixed station, a Node B, an eNodeB (eNB), an access point, and the like.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • Signal transmitting and receiving method and apparatus for the same in the wireless communication system as described above can be applied to various wireless communication systems.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé permettant d'émettre, par un terminal, d'un signal dans un système de communication sans fil, et un appareil associé. Plus particulièrement, le procédé comprend : une étape de réception d'un paramètre de réserve de ressources indiquant une pluralité de groupes de ressources permettant d'émettre et de recevoir, par un terminal, un signal provenant d'une première station de base ; et une étape de transmission d'un message au moyen d'une unité de ressources spécifiques dans un groupe de ressources spécifiques parmi la pluralité de groupes de ressources selon le paramètre de réserve de ressources, en fonction d'informations d'attribution de ressources dynamiques, chacun de la pluralité des groupes de ressources étant configuré par l'attribution successive de M unités de ressources (M étant un nombre naturel, M > 0), chacune des unités de ressources étant définie pour une liaison montante, une liaison descendante ou une liaison latérale, et les informations d'attribution de ressources dynamiques indiquant que le message doit être transmis par l'intermédiaire d'une N-ième unité de ressources parmi les unités de ressources dans le groupe de ressources spécifiques (N étant un nombre naturel, M ≥ N > 0).
PCT/KR2017/015661 2016-12-29 2017-12-28 Procédé d'émission et de réception de signal dans un système de communication sans fil, et appareil associé WO2018124776A1 (fr)

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CN201780080714.XA CN110115080B (zh) 2016-12-29 2017-12-28 在无线通信系统中发送信号和接收信号的方法及其装置
US16/473,607 US10986610B2 (en) 2016-12-29 2017-12-28 Method for transmitting and receiving signal in wireless communication system and apparatus therefor
EP17888639.6A EP3565336B1 (fr) 2016-12-29 2017-12-28 Procédé d'émission et de réception de signal dans un système de communication sans fil, et appareil associé

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US201762449112P 2017-01-23 2017-01-23
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US10986610B2 (en) 2021-04-20
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EP3565336A4 (fr) 2020-08-05
US20200154397A1 (en) 2020-05-14
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